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    Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings. The noise that affect sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
    Decibels（分贝）measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.
    Some scientists have proposed setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales.
    A team of American and Canadian scientists discovered that loud noises can seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales’ ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected.
    Many researchers whose work depends on ocean sounds object to a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.
    Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
    小题1:According to the passage, which of the following is increasingly dangerous to sea creatures?
    A．The man-made noises.
    B．The noises made by themselves.
    C．The sound of earthquakes.
    D．The sound of the ice-breaking.
    小题2:As to the influence of noises on whales, which of the following statements is true?
    A．They are deaf to noises.
    B．Noises at a certain level may hurt them.
    C．They are easily confused by noises.
    D．Noises will limit their ability to reproduce.
    小题3: We can know from the passage that many scientists think that the noise limit of one hundred twenty decibels would______.
    A．prevent them from doing their research work
    B．benefit them a lot in their research work
    C．do good to their health
    D．increase the industrial output
    小题4:According to the passage, what will scientists most probably do in the future?
    A．They will try their best to decrease noise.
    B．They will work hard to cut down noise pollution.
    C．They will study the effect of different noises.
    D．They will protect animals from harmful noises.

    小题1:A
    小题2:C
    小题3:A
    小题4:C

    试题分析：科学家认为,人类海上活动导致的噪音污染对海洋生物的健康和行为产生了巨大的影响，甚至威胁到了他们的生存。虽然科学家不知道什么样的噪音对海洋生物有害，然而许多科学家怀疑噪声的危害要远远大于他们想象的程度，因此他们要努力去防止噪声对于海洋动物的危害。
    小题1:A细节理解题。根据文章首句Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings.可知科学家认为海洋动物受到了人类噪音的威胁，故A选项正确。
    小题2:C推理判断题。根据文章第四段This seriously affected the whales’ ability to exchange information and find their way.可以推断这些海洋噪音影响到了鲸鱼的听力和导航能力，所以判断C选项正确。
    小题3:A细节理解题。根据文章倒数第二段They say such a limit would mean an end to important industrial and scientific research.可知科学家们认为对于分贝的控制会影响一些工业和科学研究工作，所以A选项正确。
    小题4:C推理判断题。在文章末段作者提到“尽管科学家们不知道哪些噪音威胁着海洋动物，但是他们要想办法去阻止噪音对于海洋生物的危害”，由此推断为了保护海洋动物他们会努力去研究这些噪音，选C。
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